mac-detect-browser.ipynb

{
 "cells": [
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "!touch test.html",
   "execution_count": 13,
   "outputs": []
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "import webbrowser\nwebbrowser.get('Safari').open('test.html')",
   "execution_count": 30,
   "outputs": [
    {
     "output_type": "execute_result",
     "execution_count": 30,
     "data": {
      "text/plain": "True"
     },
     "metadata": {}
    }
   ]
  },
  {
   "metadata": {},
   "cell_type": "markdown",
   "source": "Call LSCopyDefaultApplicationURLForURL to discover the location of the application associated with a given url.\n\nUse ctypes to call apple APIs."
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "import ctypes\nfrom ctypes import c_void_p, Structure, POINTER\n\nkCFStringEncodingUTF8 = 0x08000100\n\nCoreFoundation = ctypes.cdll.LoadLibrary(ctypes.util.find_library('CoreFoundation'))\nLaunchServices = ctypes.cdll.LoadLibrary(ctypes.util.find_library('LaunchServices'))\n\n# create CFURL from bytes\nCFURLCreateWithBytes = CoreFoundation.CFURLCreateWithBytes\nCFURLCreateWithBytes.restype = c_void_p\nCFURLCreateWithBytes.argtypes = [c_void_p, ctypes.c_char_p, ctypes.c_int, ctypes.c_uint32, c_void_p]\n\n# for debugging CreateWithBytes\nCFURLGetBytes = CoreFoundation.CFURLGetBytes\nCFURLGetBytes.restype = ctypes.c_int\nCFURLGetBytes.argtypes = [c_void_p, ctypes.c_char_p, ctypes.c_int]\n\n# get App associated with CFURL\nLSCopyDefaultApplicationURLForURL = LaunchServices.LSCopyDefaultApplicationURLForURL\nLSCopyDefaultApplicationURLForURL.restype = c_void_p\nLSCopyDefaultApplicationURLForURL.argtypes = [c_void_p, c_void_p, c_void_p]",
   "execution_count": 2,
   "outputs": []
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "def app_for_url(url):\n    \"\"\"Returns file:// url for the app associated with a url\"\"\"\n    cf_url = CFURLCreateWithBytes(\n        None,\n        url.encode('utf8'),\n        len(url),\n        kCFStringEncodingUTF8,\n        None,\n    )\n    cf_app = LSCopyDefaultApplicationURLForURL(cf_url, None, None)\n    if cf_app is None:\n        raise ValueError(\"No app found for %s\" % url)\n    buf = (ctypes.c_char * 1024)()\n    CFURLGetBytes(cf_app, buf, len(buf))\n    return buf.value.decode('utf8')\n    ",
   "execution_count": 39,
   "outputs": []
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "app_for_url(\"http://google.com\")",
   "execution_count": 40,
   "outputs": [
    {
     "output_type": "execute_result",
     "execution_count": 40,
     "data": {
      "text/plain": "'file:///Applications/Safari.app/'"
     },
     "metadata": {}
    }
   ]
  },
  {
   "metadata": {},
   "cell_type": "markdown",
   "source": "Raises if there's no application found"
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "import os\napp_for_url(\"file://\" + os.path.abspath(\"mac-detect-browser.ipynb\"))",
   "execution_count": 41,
   "outputs": [
    {
     "output_type": "error",
     "ename": "ValueError",
     "evalue": "No app found for file:///Users/benjaminrk/dev/mine/notebooks/empty/mac-detect-browser.ipynb",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-41-bd1a3a99e3f4>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mos\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0mapp_for_url\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"file://\"\u001b[0m \u001b[1;33m+\u001b[0m \u001b[0mos\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mpath\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mabspath\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"mac-detect-browser.ipynb\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;32m<ipython-input-39-d5c013765a13>\u001b[0m in \u001b[0;36mapp_for_url\u001b[1;34m(url)\u001b[0m\n\u001b[0;32m     10\u001b[0m     \u001b[0mcf_app\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mLSCopyDefaultApplicationURLForURL\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mcf_url\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;32mNone\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;32mNone\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     11\u001b[0m     \u001b[1;32mif\u001b[0m \u001b[0mcf_app\u001b[0m \u001b[1;32mis\u001b[0m \u001b[1;32mNone\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 12\u001b[1;33m         \u001b[1;32mraise\u001b[0m \u001b[0mValueError\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"No app found for %s\"\u001b[0m \u001b[1;33m%\u001b[0m \u001b[0murl\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     13\u001b[0m     \u001b[0mbuf\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m(\u001b[0m\u001b[0mctypes\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mc_char\u001b[0m \u001b[1;33m*\u001b[0m \u001b[1;36m1024\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     14\u001b[0m     \u001b[0mCFURLGetBytes\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mcf_app\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mbuf\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mlen\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mbuf\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mValueError\u001b[0m: No app found for file:///Users/benjaminrk/dev/mine/notebooks/empty/mac-detect-browser.ipynb"
     ]
    }
   ]
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "import os\napp_for_url(\"file://\" + os.path.abspath(\"untitled.txt\"))",
   "execution_count": 42,
   "outputs": [
    {
     "output_type": "execute_result",
     "execution_count": 42,
     "data": {
      "text/plain": "'file:///Applications/Sublime+Text.app/'"
     },
     "metadata": {}
    }
   ]
  },
  {
   "metadata": {},
   "cell_type": "markdown",
   "source": "webbrowser doesn't know how to handle absolute paths:"
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "webbrowser.get(\"/Applications/Safari.app\")",
   "execution_count": 44,
   "outputs": [
    {
     "output_type": "error",
     "ename": "Error",
     "evalue": "could not locate runnable browser",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mError\u001b[0m                                     Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-44-1f7ad1cf2a7d>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mwebbrowser\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mget\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"/Applications/Safari.app\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;32m~/conda/lib/python3.6/webbrowser.py\u001b[0m in \u001b[0;36mget\u001b[1;34m(using)\u001b[0m\n\u001b[0;32m     49\u001b[0m             \u001b[1;32melif\u001b[0m \u001b[0mcommand\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m \u001b[1;32mis\u001b[0m \u001b[1;32mnot\u001b[0m \u001b[1;32mNone\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     50\u001b[0m                 \u001b[1;32mreturn\u001b[0m \u001b[0mcommand\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 51\u001b[1;33m     \u001b[1;32mraise\u001b[0m \u001b[0mError\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"could not locate runnable browser\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     52\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     53\u001b[0m \u001b[1;31m# Please note: the following definition hides a builtin function.\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mError\u001b[0m: could not locate runnable browser"
     ]
    }
   ]
  },
  {
   "metadata": {},
   "cell_type": "markdown",
   "source": "So we pick out the base name of the .app and hope that works:"
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "from urllib.parse import unquote\n\ndef app_name_for_url(url):\n    \"\"\"Return the name of an app associated with a url\"\"\"\n    app = app_for_url(url)\n    path = app.split('://', 1)[1]\n    basename = path.rstrip('/')\n    name, dotapp = os.path.splitext(os.path.basename(path.rstrip('/')))\n    return unquote(name)",
   "execution_count": 45,
   "outputs": []
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "app_name_for_url('http://google.com')",
   "execution_count": 46,
   "outputs": [
    {
     "output_type": "execute_result",
     "execution_count": 46,
     "data": {
      "text/plain": "'Safari'"
     },
     "metadata": {}
    }
   ]
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "browser = webbrowser.get(app_name_for_url('http://jupyter.org'))\nbrowser.open(\"file://\" + os.path.abspath(\"test.html\"))",
   "execution_count": 47,
   "outputs": [
    {
     "output_type": "execute_result",
     "execution_count": 47,
     "data": {
      "text/plain": "True"
     },
     "metadata": {}
    }
   ]
  }
 ],
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